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W. E. M CORQUODALE HOT WATER HEATER ATTACHMENT March 14, 1933.

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gwuwnto z Maw uaZaZe lll Patented Mar. 14, 1933 iiitlTED dTATtES @FFICE OF ORANGE, TEXAS, assrenoa '20 MRS. GLADYS lncoone'uonnnn READY, or ORANGE, TEXAS, Ann nn.

W. H. BENNETT, 0F HUMBLE,

HOT WATER HEATER ATTACHMENT Application filed June 2, 1928.

This invention relates to attachments for hot water heating devices and has for its primary object the provision, in a manner as hereinafter set forth, of means whereby a burner element may be controlled by the flow of water through the heater device in connection with which the attachment is used.

The invention broadly contemplates the provision of a water casing having each end provided with means for setting up connection therewith with one end of a water heating coil, the casing being provided with a gas or fuel controlling thermostat device in the end connected to the adjacent end of the heater coil. Means is provided for introducing water into the casing adjacent the thermostat device so that when water is drawn from the heating coil, the cold water entering the casin will chill the thermostat and cause the same to open the fuel supply line leading to a heater element located in the usual position below the coil.

Another object of the invention is to provide means whereby a momentary continuation of the heating action of the burner will result after the flow of the Water through the coil has ceased to cause a circulation of the warm water from the coil, through the water casing attached thereto to raise the temperature of the thermostat and to cause the same to automatically out 01f the fuel supply to the heater burner.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawings but may be changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claim.

In the drawings Figure 1 is a view in side elevation of one form of heater attachment embodying the present invention, parts thereof being Serial No. 282,449.

broken away, the same being shown attached to a heater;

Figure 2 is a view in side elevation of one modified form of attachment, the same being partly in section;

Figure 3 is a view in side elevation of a further modified form of attachment, the same being partly in section;

Figure a is a view in side elevation of a still. further modification of the attachment.

Referring to the drawings in detail wherein similar reference numerals indicate corresponding parts throughout the several views, one form of the structure embodying the present invention is shown in Figure 1 wherein is shown an elongated casing 1 preferably of circular cross section, which casing is provided with lugs 2 to which are attached supporting brackets 3, which brackets may be employed for maintaining the casing in upright position adjacent the water heater in connection with which the attachment is to be used.

At the upper end of the water casing 1, there is attached thereto a four-way casting or coupling 4 which casting is provided with the lateral arms or nipples 5 and 6 and the upwardly extending nipple 7 to which a cold water inlet pipe 8 may be attached. Connected to this nipple 7 within the coupling is a pipe 9 which extends longitudinally within the cas'ng l to a point approximately midway between the ends thereof so that water introduced to the casing through the pipe 8 and this pipe 9 will be introduced into the central portion of the same. While a four-way coupling has been shown and described, as this construction is used when connecting up two heaters, it is, of course, to be understood that a three-way coupling may be employed at the upper and lower ends of the casing l and the other casings shown.

The casing may also be provided intermediate its ends with the lateral nipple 10 an elbow 11 may be threaded with one end thereof extended into and directed downwardly in the casing in the manner shown, for the introduction of cold water through the side of the casing instead of through the top thereof, it desired.

The lower end 01" the casing 1 also has threadedly attached thereto a four-way coupling 12 which is provided with 0ppositely tirected lateral nipples 13 and 1d and a dmvnwardly opening nipple 15. In the downwardlv opening nipple 15 ot the is threaded a suitable couplin' 12, there controlled valve element 1 the passage thernu tatically 16 which is designed to control of fuel such as g is, from a supply line 17 to a burner feeding pipe 18, this valve 16 carrying and being controlled by the temperature respoi element 9 which e2;- tends upwardly into the casing 1 to a point adjacent "he inlet end of the pipe 9 and of the inlet coupling 11.

The attachment thus -lar described is con nected at the upper and lower ends to the ends of a we heating coil 20, a relatively small connect pipe coupling the upper end of the attachment with the three-way coupling 22 carried at the upper end of the coil, the third outlet this coupling being designed to have wa er draw-oil pipe (not $1101.11)- connectc l the 7th. The lower end of the casing is cpnnected directly to the lower end of the con 20 by means oi the pipe The four-way couplings 5 and 12 have been shown and described as having opposite directed ateral nipples, this type or coupling being preierably employed to permit the use or the attachment with two water heaters if desired.

\Vhen used in connection with one heater only, as described in the present case, one of the lat ral openings of each coupling can, of course, be readily closed.

Vhen in use, one only of the water inlets 8 or 11 is used and when water is drawn from the coil 20 through the pipe connected with the coupling an additional supply will, of course, enter the casing 1 and chill or cool the thermostat 19 located therein. This will cause the thermostat to actuate the valve element 16 to open the fuel supply line which connects with the burner supply pipe 18, thus permitting the constantly burning pilot 2 1 to ignite the gas issuing from the burner which is located beneath the coil in the usual manner. The water passing through the coil will consequently be instantly heated for use. After stopping the flow of water th ough the coil, the heated water remaining therein will pass through the relatively small return pipe which connects upper end of the coil with the upper l of the casing 1, thus setting up sufficient circulation through the coil and casing to bring the warm water with the thermostat eledown into contact ment 19. This will cause the thermostat to again actuate the valve 16 to cut off the fuel supply to the burner 25.

lVhile the cold water supply pipe 8 which enters the upper end of the casing 1 has been shown as connected with a pipe 9 which leads downwardly into the central portion of the casing it is, of course, to be understood that this structure is not tial to the proper operation of the device the pipe 8 may be terminated within the coupling 4:, the small size of the return pipe 21 as compared to the size of the supply pipe and ol' the water coil causing the water to circulate downwardly through the casing to and through the lower end of the coil instead of passing from the coupling 5 directly to the coupling 22.

This action is also assured by reason of the pressure behind the incoming water entering the casing 1 which acts in the nature of an injector to direct the pressure of the flow toward the opposite end of the casing 1 and the inlet end of the water coil. Since this flow under pressure passes across the end of the cross-over pipe 21, thus reducing the tencency of the water to tlow into the cross-over pipe, this action is increased when the extension 9 is applied to the inlet pipe 8 so that the introduction of the water into the casing 1 is adjacent the center thereof and consequently further removed from he cross-over pipe.

In Figure 2 a different assembly ot the attachment is shown, the essential features of construction of the same being unchanged. In this construction the thermostat valve 26 and the thermostat element 2? is mounted in horizontal position exteriorly of the heating coil housing or shell 28, the lower end of the coil being extended laterally through the wall of the shell to enter the coupling 31 of the thermostat casing 30. The coupling 31 is preferably of the three-way or T type, one arm engaging the thermostat casing, another receiving the adjacent end of the coil 29 and the third receiving the threaded portion 32 of the thermostat valve structure.

The outer end of the casing 30 is coupled to the vertical water casing by means of the elbow coupling 3%. This coupling 34 may be provided with a third nipple arranged in alincnient with the nipple in which the end of the casing 30 engages. to rece1ve the threaded portion thereof is ing 33 is provided with a four-way coupling 41 similar to the coupling 4, previously described, one nipple of which is connected 2y the pipe l2 with the coupling 43 which is attached to the upper outlet end of the coil 29. As in the other structure, the cold wat r may be introduced to the casings 3 l through the inlet pipe a l which passes tarough one of the nipples of the conand into the casing The action of the structure shown in Fig e 2 the same as that of the structiue snown in Figure 1.

In Figures 3 and 4 a further modification of the assembly of the water heater attachment is shown. in this case, the vertical water casing is employed and has the thermostatically operated valve structure :6 connected to the upwardly opening nipple l? of the four-way coupling 48, which is threaded upon the upper end thereof, the thermostat element 49 controlling this valve extending downwardly into the casing in the manner shown. One of the nipples 50 of the coupling 48 has connected thereto a pipe 51 which, as in the other forms, conn cts with a three-way coupling attached to the upper end of the heater coil 53, the hird nipple of this coupling being designed -0 have a water drawpif pipe attached thereo. in this form the water casing 45 has the water inlet nipple 54L tapped through the wall thereof at the upper end, the cold water entering the casing at the side of the thermostat element The lower end of the casing 45 has a two-way coupling 55 attached thereto, one nipple of which connects with the other or lower end of the coil In Figure 4 the attachment is shown as having a storage tank associated therewith. In this form, the water casing 56 is prcfer abl mounted in a position elevated above the coil 57 of the heater and has a hot water storage tank 58 mounted adjacent thereto. This tank may be provided with a covering of insulation to maintain the contents thereof warm over an extended period. i The casing 56, like the casings described in connection with the other assemblies, is provided at the upper and lower ends with couplings 59 and 60 respectively, the upper coupling havin an upwardly opening nipple 61 and a laterally opening nipple 62. The lateral nipple is connected by a pipe 63 with a three-way coupling 64, one nipple of which is attached and opens into the top of the tank 58 while the third outlet connected to the water draw-off pipe 65.

h lower coupling 60 is also provided wi h a downwardly opening nipple 66 and a lateral nipple 67, the nipple 66 having the thermostat controlled valve 68 threaded thereinto. to maintain the thermostat element 69 in position within and longitudinally of the casing 56 in the usual manner. The lateral nipple 67 of the lower coupling is connected by the pipe 70 with the lower end of the heater coil 57, the upper end thereof being attached to-the tank 58 to openinto the lower end of the same. i c

As in each of the other forms, the thermostat valve 68 contr0ls the flow of fuel to the burner 71 of the heater, which is lighted when the fuel line is opened, by the pilot 72.

The casing 56 may be supplied with cold vwater either through the pipe line 73 connected to the nipple 61 of the upper coupling 59 and discharged into the central portion of the casing, in the manner described in connection with the other forms, or the casing may be provided with the lateral elbow couplings? adjacent the end of the thermostatelement 69.

While a pilot has been described only'in association with the modified form of the water heater shown in Figure 1, each of the other forms of the heater is illustrated as having a pilot associated therewith and it will therefore be apparent that each heater, when in use, has a constantly burning pilot light from which the gas issuing from the main burner, when the thermostatic valve is actuated, is ignited.

While the present description has been confined to the showing of single heating coil units, it is to be understood that I do not wish to be restricted to the use of single units for it will be readily apparent that the heaters may be hooked up in multiple to form a battery for the provision of a large quantity of heatedwater. It will also be readily understood that if desired or if more convenient the inlet connections may be made to supply water through the couplings 22, 43 and 52, and the couplings 6, 7 and 47 may be employed for outlets.

From the foregoing it will be seen that any one of the attachment devices described can be employed in connection with any of the usual gas water heaters to convert the same to an instantaneous heater and it will also be appreciated that with a device of this character the heating of an unnecessary amount of water will be avoided, the device acting automatically to turn ofl the gas to the burner when flow of water is stopped.

Having described the invention what I claim is An attachment for water heaters employing a coil or similar element and a heating unit associated therewith including a water casing of relatively small diameter disposed adjacent to and approximately parallel with the coil, a pipe connecting one end of said casing with the intake of the coil, a crossover pipe of a diameter less than the inwhich opens thereinto.

terior diameter of the coil and unobstructed throughout its length directly connecting the opposite end of the water casing with the draw-off end of the coil, valve means controlling the flow of fuel to the heating element, means f0r discharging water into the casing intermediate the ends thereof and below the cross-over pipe and in a direction away from the end of the cross-over pipe 10 whereby to obtain an injector effect operating in conjunction with the resistance of the small diameter-ed cross-over pipe to maintain a circulation of water through the coil and out of the discharge end thereof when 1'5 the heater is in use, and a heat sensitive element operatively connected with and controlling said valve means and disposed at a point where the water entering the casing intermediate the ends thereof will come in an intimate contact with said heat sensitive element.

In testimony whereof I hereunto afiix my signature.

as WILMER E. MCCORQUODALE! 

